"I don't want to shoot my mouth off," says Rodgers, who collects grease from places around Prineville that she won't name. "I can't say too much about my feedstock. It is just so competitive." Not long ago, restaurants might have paid Rodgers to haul away their oily dribbles. But with a runaway commodity market and growing friction in the food vs. fuel conflict, secondhand grease has become the diamond of gemstones to biodiesel brewers. Now, the grease crisis has become just one part of a slippery slope that threatens Oregon's biodiesel bonanza.